<template>
  <!-- 规格弹窗 -->
  <su-popup :show="show" round="10" @close="emits('close')">
    <view class="ss-modal-box bg-white ss-flex-col">
      <view class="modal-header ss-flex ss-col-center">
        <view class="header-left ss-m-r-30">
          <image
            class="sku-image"
            :src="sheep.$url.cdn(state.selectedSkuPrice.image || state.goodsInfo.image)"
            mode="aspectFill"
          >
          </image>
        </view>
        <view class="header-right ss-flex-col ss-row-between ss-flex-1">
          <view class="goods-title ss-line-2">{{ state.goodsInfo.title }}</view>
          <view class="header-right-bottom ss-flex ss-col-center ss-row-between">
            <view class="price-text">
              {{ state.selectedSkuPrice.groupon_price || formatPrice(state.goodsInfo.price) }}
            </view>
            <view class="tig ss-flex ss-col-center">
              <view class="tig-icon ss-flex ss-col-center ss-row-center">
                <text class="cicon-alarm"></text>
              </view>
              <view class="tig-title">秒杀价</view>
            </view>
            <view class="stock-text ss-m-l-20">
              库存{{ state.selectedSkuPrice.stock || state.goodsInfo.stock }}件
            </view>
          </view>
        </view>
      </view>
      <view class="modal-content ss-flex-1">
        <scroll-view scroll-y="true" class="modal-content-scroll">
          <view class="sku-item ss-m-b-20" v-for="sku1 in state.goodsInfo.skus" :key="sku1.id">
            <view class="label-text ss-m-b-20">{{ sku1.name }}</view>
            <view class="ss-flex ss-col-center ss-flex-wrap">
              <button
                class="ss-reset-button spec-btn"
                v-for="sku2 in sku1.children"
                :class="[
                  {
                    'checked-btn': state.currentSkuArray[sku2.parent_id] == sku2.id,
                  },
                  {
                    'disabled-btn': sku2.disabled == true,
                  },
                ]"
                :key="sku2.id"
                :disabled="sku2.disabled == true"
                @tap="onSelectSku(sku2.parent_id, sku2.id)"
              >
                {{ sku2.name }}
              </button>
            </view>
          </view>
          <view class="buy-num-box ss-flex ss-col-center ss-row-between">
            <view class="label-text">购买数量</view>
            <su-number-box
              :min="1"
              :max="state.selectedSkuPrice.stock"
              :step="1"
              v-model="state.selectedSkuPrice.goods_num"
              activity="seckill"
            ></su-number-box>
          </view>
        </scroll-view>
      </view>
      <view class="modal-footer">
        <view class="buy-box ss-flex ss-col-center ss-flex ss-col-center ss-row-center">
          <button class="ss-reset-button buy-btn" @tap="onBuy">确认</button>
        </view>
      </view>
    </view>
  </su-popup>
</template>

<script setup>
  /**
   * 1. 根据spus获得skus： 后台已算好
   * 2. 用路径字典，生成路径map
   * 3. 计算用户选择后，其他路径是否可用
   */
  // 按钮状态： active,nostock
  import { computed, reactive, watch } from 'vue';
  import sheep from '@/sheep';
  const emits = defineEmits(['change', 'addCart', 'buy', 'close']);
  const props = defineProps({
    modelValue: {
      type: Object,
      default() {},
    },
    show: {
      type: Boolean,
      default: false,
    },
  });
  const state = reactive({
    goodsInfo: computed(() => props.modelValue),
    skuPrices: computed(() => {
      let skuPrices = props.modelValue.sku_prices;
      if (props.modelValue.is_sku) {
        skuPrices.forEach((item) => {
          item.goods_sku_id_arr = item.goods_sku_ids.split(',');
        });
      }
      return skuPrices;
    }),
    skuList: props.modelValue.skus,
    selectedSkuPrice: {},
    currentSkuArray: [],
  });
  if (!state.goodsInfo.is_sku) {
    state.selectedSkuPrice = state.goodsInfo.sku_prices[0];
  }

  watch(
    () => state.selectedSkuPrice,
    (newVal) => {
      emits('change', newVal);
    },
    {
      immediate: true, // 立即执行
      deep: true, // 深度监听
    },
  );

  // 格式化价格
  const formatPrice = (e) => {
    return e.length === 1 ? e[0] : e.join('~');
  };
  const onAddCart = () => {
    if (state.selectedSkuPrice.goods_id) {
      if (state.selectedSkuPrice.stock <= 0) {
        sheep.$helper.toast('库存不足');
      } else {
        emits('addCart', state.selectedSkuPrice);
      }
    } else {
      sheep.$helper.toast('请选择规格');
    }
  };

  const onBuy = () => {
    if (state.selectedSkuPrice.goods_id) {
      if (state.selectedSkuPrice.stock <= 0) {
        sheep.$helper.toast('库存不足');
      } else {
        emits('buy', state.selectedSkuPrice);
      }
    } else {
      sheep.$helper.toast('请选择规格');
    }
  };
  // 改变禁用状态
  const changeDisabled = (isChecked = false, pid = 0, skuId = 0) => {
    let newPrice = []; // 所有可以选择的 skuPrice

    if (isChecked) {
      // 选中规格
      // 当前点击选中规格下的 所有可用 skuPrice
      for (let price of state.skuPrices) {
        if (price.stock <= 0) {
          // this.goodsNum 不判断是否大于当前选择数量，在 uni-number-box 判断，并且 取 stock 和 goods_num 的小值
          continue;
        }
        if (price.goods_sku_id_arr.indexOf(skuId.toString()) >= 0) {
          newPrice.push(price);
        }
      }
    } else {
      // 取消选中
      // 当前所选规格下，所有可以选择的 skuPrice
      newPrice = getCanUseSkuPrice();
    }

    // 所有存在并且有库存未选择的规格项 的 子项 id
    let noChooseSkuIds = [];
    for (let price of newPrice) {
      noChooseSkuIds = noChooseSkuIds.concat(price.goods_sku_id_arr);
    }

    // 去重
    noChooseSkuIds = Array.from(new Set(noChooseSkuIds));

    if (isChecked) {
      // 去除当前选中的规格项
      let index = noChooseSkuIds.indexOf(skuId.toString());
      noChooseSkuIds.splice(index, 1);
    } else {
      // 循环去除当前已选择的规格项
      state.currentSkuArray.forEach((sku) => {
        if (sku.toString() != '') {
          // sku 为空是反选 填充的
          let index = noChooseSkuIds.indexOf(sku.toString());
          if (index >= 0) {
            // sku 存在于 noChooseSkuIds
            noChooseSkuIds.splice(index, 1);
          }
        }
      });
    }

    // 当前已选择的规格大类
    let chooseSkuKey = [];
    if (!isChecked) {
      // 当前已选择的规格大类
      state.currentSkuArray.forEach((sku, key) => {
        if (sku != '') {
          // sku 为空是反选 填充的
          chooseSkuKey.push(key);
        }
      });
    } else {
      // 当前点击选择的规格大类
      chooseSkuKey = [pid];
    }

    for (let i in state.skuList) {
      // 当前点击的规格，或者取消选择时候 已选中的规格 不进行处理
      if (chooseSkuKey.indexOf(state.skuList[i]['id']) >= 0) {
        continue;
      }

      for (let j in state.skuList[i]['children']) {
        // 如果当前规格项 id 不存在于有库存的规格项中，则禁用
        if (noChooseSkuIds.indexOf(state.skuList[i]['children'][j]['id'].toString()) >= 0) {
          state.skuList[i]['children'][j]['disabled'] = false;
        } else {
          state.skuList[i]['children'][j]['disabled'] = true;
        }
      }
    }
  };
  // 当前所选规格下，获取所有有库存的 skuPrice
  const getCanUseSkuPrice = () => {
    let newPrice = [];

    for (let price of state.skuPrices) {
      if (price.stock <= 0) {
        // || price.stock < this.goodsNum		不判断是否大于当前选择数量，在 uni-number-box 判断，并且 取 stock 和 goods_num 的小值
        continue;
      }
      var isOk = true;

      state.currentSkuArray.forEach((sku) => {
        // sku 不为空，并且，这个 条 skuPrice 没有被选中,则排除
        if (sku.toString() != '' && price.goods_sku_id_arr.indexOf(sku.toString()) < 0) {
          isOk = false;
        }
      });

      if (isOk) {
        newPrice.push(price);
      }
    }

    return newPrice;
  };
  // 选择规格
  const onSelectSku = (pid, skuId) => {
    // 清空已选择
    let isChecked = true; // 选中 or 取消选中
    if (state.currentSkuArray[pid] != undefined && state.currentSkuArray[pid] == skuId) {
      // 点击已被选中的，删除并填充 ''
      isChecked = false;
      state.currentSkuArray.splice(pid, 1, '');
    } else {
      // 选中
      state.currentSkuArray[pid] = skuId;
    }

    let chooseSkuId = []; // 选中的规格大类
    state.currentSkuArray.forEach((sku) => {
      if (sku != '') {
        // sku 为空是反选 填充的
        chooseSkuId.push(sku);
      }
    });

    // 当前所选规格下，所有可以选择的 skuPric
    let newPrice = getCanUseSkuPrice();

    // 判断所有规格大类是否选择完成
    if (chooseSkuId.length == state.skuList.length && newPrice.length) {
      newPrice[0].goods_num = state.selectedSkuPrice.goods_num || 1;
      state.selectedSkuPrice = newPrice[0];
    } else {
      state.selectedSkuPrice = {};
    }

    // 改变规格项禁用状态
    changeDisabled(isChecked, pid, skuId);
  };

  changeDisabled(false);
</script>

<style lang="scss" scoped>
  // 购买
  .buy-box {
    padding: 10rpx 20rpx;

    .buy-btn {
      width: 100%;
      height: 80rpx;
      border-radius: 40rpx;
      background: linear-gradient(90deg, #ff5854, #ff2621);
      color: #fff;
    }
  }

  .ss-modal-box {
    border-radius: 30rpx 30rpx 0 0;
    max-height: 1000rpx;

    .modal-header {
      position: relative;
      padding: 80rpx 20rpx 40rpx;

      .sku-image {
        width: 160rpx;
        height: 160rpx;
        border-radius: 10rpx;
      }

      .header-right {
        height: 160rpx;
      }

      .close-icon {
        position: absolute;
        top: 10rpx;
        right: 20rpx;
        font-size: 46rpx;
        opacity: 0.2;
      }

      .goods-title {
        font-size: 28rpx;
        font-weight: 500;
        line-height: 42rpx;
      }

      .price-text {
        font-size: 30rpx;
        font-weight: 500;
        color: $red;
        font-family: OPPOSANS;

        &::before {
          content: '￥';
          font-size: 24rpx;
        }
      }

      .stock-text {
        font-size: 26rpx;
        color: #999999;
      }
    }

    .modal-content {
      padding: 0 20rpx;

      .modal-content-scroll {
        max-height: 600rpx;

        .label-text {
          font-size: 26rpx;
          font-weight: 500;
        }

        .buy-num-box {
          height: 100rpx;
        }

        .spec-btn {
          height: 60rpx;
          min-width: 100rpx;
          padding: 0 30rpx;
          background: #f4f4f4;
          border-radius: 30rpx;
          color: #434343;
          font-size: 26rpx;
          margin-right: 10rpx;
          margin-bottom: 10rpx;
        }

        .checked-btn {
          background: linear-gradient(90deg, #ff5854, #ff2621);
          font-weight: 500;
          color: #ffffff;
        }

        .disabled-btn {
          font-weight: 400;
          color: #c6c6c6;
          background: #f8f8f8;
        }
      }
    }
  }

  .tig {
    border: 2rpx solid #ff5854;
    border-radius: 4rpx;
    width: 126rpx;
    height: 38rpx;

    .tig-icon {
      width: 40rpx;
      height: 40rpx;
      background: #ff5854;
      border-radius: 4rpx 0 0 4rpx;

      .cicon-alarm {
        font-size: 32rpx;
        color: #fff;
      }
    }

    .tig-title {
      font-size: 24rpx;
      font-weight: 500;
      line-height: normal;
      color: #ff6000;
      width: 86rpx;
      display: flex;
      justify-content: center;
      align-items: center;
    }
  }
</style>
